I have to say I think the rate's and all are fairly good as they are.
Leveling Characters can be done in a reasonably short amount of time,
yet not so short that your quests become grey before you can complete the objectives. Also, you get a bit of time to see the zone
The Money Drops seems to be covering skills, items and repairs well, without so much dropping that money becomes pointless. And rare drops? I have no idea!

I would like some thing to increase.
WOTLK will come, chars will be deleted and I hate leveling them again.

I'm always for increasing experience, as players still without level 70's need some nice gear at level 40.
I rarely see rare items. I'm ok with money as I always grind with my mining and jewel-crafting.

Gold drop I wouldn't mind seeing a slight bump just to make getting extra money for them last few craft points a bit easier. (I have an alt I can gather with, so it's not TOO bad).

Item drops would just make farming a little easier. I'd rather farm than bother GMs for green level items, but I'm not at the age/have the time/addicted enough to farm hours for a dress. Of course, I know some people who do run through should put their stuff on the AH more. I really doubt Auctioneer will be working in time for Wrath. (I could be very wrong on that)

XP rate... It's too soon for me to answer in terms of Wrath.

Pre-Wrath, leveling wasn't even the focus of the server. I'm still not sure why people complain about it when they could RP and grind for vouches instead and hit 70 that way. Just log in and dive in a pack of RPers.